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		samatman on July 1, 2010 \| parent \| context \| favorite \| on: Where does a tree get its mass? Default assumption for whom? For a scientist, or someone working with real world data, this should never be the default assumption. Besides, in the paragraph with the arithmetic he explicitly talks about significant figures. In context, the answer is unambiguously 7 .

djacobs on July 1, 2010 [–]

It's 7.2. Without context (and he gives none for the expression) everyone (including me as a scientist) must assume abstract numbers. What's more, we know he's not using measurements because there are no units...

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